/*
* arch/m68k/q40/q40ints.c
*
* Copyright (C) 1999,2001 Richard Zidlicky
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* .. used to be losely based on bvme6000ints.c
*
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <asm/rtc.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/hardirq.h>
#include <asm/traps.h>
#include <asm/q40_master.h>
#include <asm/q40ints.h>
/*
* Q40 IRQs are defined as follows:
* 3,4,5,6,7,10,11,14,15 : ISA dev IRQs
* 16-31: reserved
* 32 : keyboard int
* 33 : frame int (50/200 Hz periodic timer)
* 34 : sample int (10/20 KHz periodic timer)
*
*/
extern int ints_inited;
void q40_irq2_handler (int, void *, struct pt_regs *fp);
extern void (*q40_sys_default_handler[]) (int, void *, struct pt_regs *);
static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs);
#define DEVNAME_SIZE 24
static struct q40_irq_node {
void (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
void *dev_id;
/* struct q40_irq_node *next;*/
char devname[DEVNAME_SIZE];
unsigned count;
unsigned short state;
} irq_tab[Q40_IRQ_MAX+1];
short unsigned q40_ablecount[Q40_IRQ_MAX+1];
/*
* void q40_init_IRQ (void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function is called during kernel startup to initialize
* the q40 IRQ handling routines.
*/
static int disabled=0;
void q40_init_IRQ (void)
{
int i;
disabled=0;
for (i = 0; i <= Q40_IRQ_MAX; i++) {
irq_tab[i].handler = q40_defhand;
irq_tab[i].flags = 0;
irq_tab[i].dev_id = NULL;
/* irq_tab[i].next = NULL;*/
irq_tab[i].devname[0] = 0;
irq_tab[i].count = 0;
irq_tab[i].state =0;
q40_ablecount[i]=0; /* all enabled */
}
/* setup handler for ISA ints */
sys_request_irq(IRQ2,q40_irq2_handler, 0, "q40 ISA and master chip", NULL);
/* now enable some ints.. */
master_outb(1,EXT_ENABLE_REG); /* ISA IRQ 5-15 */
/* make sure keyboard IRQ is disabled */
master_outb(0,KEY_IRQ_ENABLE_REG);
}
int q40_request_irq(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
/*printk("q40_request_irq %d, %s\n",irq,devname);*/
if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
/* test for ISA ints not implemented by HW */
switch (irq)
{
case 1: case 2: case 8: case 9:
case 12: case 13:
printk("%s: ISA IRQ %d from %s not implemented by HW\n", __FUNCTION__, irq, devname);
return -ENXIO;
case 11:
printk("warning IRQ 10 and 11 not distinguishable\n");
irq=10;
default:
}
if (irq<Q40_IRQ_SAMPLE)
{
if (irq_tab[irq].dev_id != NULL)
{
printk("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_tab[irq].devname);
return -EBUSY;
}
/*printk("IRQ %d set to handler %p\n",irq,handler);*/
if (dev_id==NULL)
{
printk("WARNING: dev_id == NULL in request_irq\n");
dev_id=(void*)1;
}
irq_tab[irq].handler = handler;
irq_tab[irq].flags = flags;
irq_tab[irq].dev_id = dev_id;
strncpy(irq_tab[irq].devname,devname,DEVNAME_SIZE);
irq_tab[irq].state = 0;
return 0;
}
else {
/* Q40_IRQ_SAMPLE :somewhat special actions required here ..*/
sys_request_irq(4,handler,flags,devname,dev_id);
sys_request_irq(6,handler,flags,devname,dev_id);
return 0;
}
}
void q40_free_irq(unsigned int irq, void *dev_id)
{
if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) {
printk("%s: Incorrect IRQ %d, dev_id %x \n", __FUNCTION__, irq, (unsigned)dev_id);
return;
}
/* test for ISA ints not implemented by HW */
switch (irq)
{
case 1: case 2: case 8: case 9:
case 12: case 13:
printk("%s: ISA IRQ %d from %x illegal\n", __FUNCTION__, irq, (unsigned)dev_id);
return;
case 11: irq=10;
default:
}
if (irq<Q40_IRQ_SAMPLE)
{
if (irq_tab[irq].dev_id != dev_id)
printk("%s: Removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, irq_tab[irq].devname);
irq_tab[irq].handler = q40_defhand;
irq_tab[irq].flags = 0;
irq_tab[irq].dev_id = NULL;
/* irq_tab[irq].devname = NULL; */
/* do not reset state !! */
}
else
{ /* == Q40_IRQ_SAMPLE */
sys_free_irq(4,dev_id);
sys_free_irq(6,dev_id);
}
}
void q40_process_int (int level, struct pt_regs *fp)
{
printk("unexpected interrupt %x\n",level);
}
/*
* this stuff doesn't really belong here..
*/
int ql_ticks=0; /* 200Hz ticks since last jiffie */
static int sound_ticks=0;
#define SVOL 45
void q40_mksound(unsigned int hz, unsigned int ticks)
{
/* for now ignore hz, except that hz==0 switches off sound */
/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
if (hz==0)
{
if (sound_ticks)
sound_ticks=1;
*DAC_LEFT=128;
*DAC_RIGHT=128;
return;
}
/* sound itself is done in q40_timer_int */
if (sound_ticks == 0) sound_ticks=1000; /* pretty long beep */
sound_ticks=ticks<<1;
}
static void (*q40_timer_routine)(int, void *, struct pt_regs *);
static void q40_timer_int (int irq, void * dev, struct pt_regs * regs)
{
#if (HZ==100)
ql_ticks = ql_ticks ? 0 : 1;
if (sound_ticks)
{
unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
sound_ticks--;
*DAC_LEFT=sval;
*DAC_RIGHT=sval;
}
#if defined(CONFIG_Q40RTC) || defined(CONFIG_GEN_RTC)
if (gen_rtc_irq_ctrl && (q40rtc_oldsecs != RTC_SECS))
{
q40rtc_oldsecs = RTC_SECS;
gen_rtc_irq_flags = RTC_UIE;
gen_rtc_interrupt(0);
}
#endif
if (ql_ticks) return;
#endif
q40_timer_routine(irq, dev, regs);
}
void q40_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
{
int timer_irq;
q40_timer_routine = timer_routine;
#if (HZ==10000)
timer_irq=Q40_IRQ_SAMPLE;
#else
timer_irq=Q40_IRQ_FRAME;
#endif
/*printk("registering sched/timer IRQ %d, handler %p\n", timer_irq,q40_timer_int);*/
/*printk("timer routine %p\n",q40_timer_routine);*/
if (request_irq(timer_irq, q40_timer_int, 0,
"timer", q40_timer_int))
panic ("Couldn't register timer int");
#if (HZ==10000)
master_outb(SAMPLE_LOW,SAMPLE_RATE_REG);
master_outb(-1,SAMPLE_CLEAR_REG);
master_outb(1,SAMPLE_ENABLE_REG);
#else
master_outb(-1,FRAME_CLEAR_REG); /* not necessary ? */
#if (HZ==100)
master_outb( 1,FRAME_RATE_REG);
#endif
#endif
}
/*
* tables to translate bits into IRQ numbers
* it is a good idea to order the entries by priority
*
*/
struct IRQ_TABLE{ unsigned mask; int irq ;};
#if 0
static struct IRQ_TABLE iirqs[]={
{IRQ_FRAME_MASK,Q40_IRQ_FRAME},
{IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
{0,0}};
#endif
static struct IRQ_TABLE eirqs[]={
{IRQ3_MASK,3}, /* ser 1 */
{IRQ4_MASK,4}, /* ser 2 */
{IRQ14_MASK,14}, /* IDE 1 */
{IRQ15_MASK,15}, /* IDE 2 */
{IRQ6_MASK,6}, /* floppy */
{IRQ7_MASK,7}, /* par */
{IRQ5_MASK,5},
{IRQ10_MASK,10},
{0,0}};
/* complain only this many times about spurious ints : */
static int ccleirq=60; /* ISA dev IRQ's*/
/*static int cclirq=60;*/ /* internal */
/* FIXME: add shared ints,mask,unmask,probing.... */
#define IRQ_INPROGRESS 1
/*static unsigned short saved_mask;*/
static int do_tint=0;
#define DEBUG_Q40INT
/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */
static int mext_disabled=0; /* ext irq disabled by master chip? */
static int aliased_irq=0; /* how many times inside handler ?*/
/* got level 2 interrupt, dispatch to ISA or keyboard/timer IRQs */
void q40_irq2_handler (int vec, void *devname, struct pt_regs *fp)
{
unsigned mir;
unsigned mer;
int irq,i;
repeat:
mir=master_inb(IIRQ_REG);
if (mir&IRQ_FRAME_MASK)
{ /* dont loose ticks */
do_tint++;
master_outb(-1,FRAME_CLEAR_REG);
}
if ((mir&IRQ_SER_MASK) || (mir&IRQ_EXT_MASK))
{
/* some ISA dev caused the int */
mer=master_inb(EIRQ_REG);
for (i=0; eirqs[i].mask; i++)
{
if (mer&(eirqs[i].mask))
{
irq=eirqs[i].irq;
/*
* There is a little mess wrt which IRQ really caused this irq request. The
* main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
* are read - which is long after the request came in. In theory IRQs should
* not just go away but they occassionally do
*/
if (irq>4 && irq<=15 && mext_disabled)
{
/*aliased_irq++;*/
goto iirq;
}
if (irq_tab[irq].handler == q40_defhand )
{
printk("handler for IRQ %d not defined\n",irq);
continue; /* ignore uninited INTs :-( */
}
if ( irq_tab[irq].state & IRQ_INPROGRESS )
{
/* some handlers do sti() for irq latency reasons, */
/* however reentering an active irq handler is not permitted */
#ifdef IP_USE_DISABLE
/* in theory this is the better way to do it because it still */
/* lets through eg the serial irqs, unfortunately it crashes */
disable_irq(irq);
disabled=1;
#else
/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",irq,disabled ? "already" : "not yet"); */
fp->sr = (((fp->sr) & (~0x700))+0x200);
disabled=1;
#endif
goto iirq;
}
irq_tab[irq].count++;
irq_tab[irq].state |= IRQ_INPROGRESS;
irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp);
irq_tab[irq].state &= ~IRQ_INPROGRESS;
/* naively enable everything, if that fails than */
/* this function will be reentered immediately thus */
/* getting another chance to disable the IRQ */
if ( disabled )
{
#ifdef IP_USE_DISABLE
if (irq>4){
disabled=0;
enable_irq(irq);}
#else
disabled=0;
/*printk("reenabling irq %d\n",irq); */
#endif
}
goto repeat; /* return; */
}
}
if (mer && ccleirq>0 && !aliased_irq)
printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--;
}
iirq:
mir=master_inb(IIRQ_REG);
if (mir&IRQ_FRAME_MASK)
{
do_tint++;
master_outb(-1,FRAME_CLEAR_REG);
}
for(;do_tint>0;do_tint--)
{
irq_tab[Q40_IRQ_FRAME].count++;
irq_tab[Q40_IRQ_FRAME].handler(Q40_IRQ_FRAME,irq_tab[Q40_IRQ_FRAME].dev_id,fp);
}
if (mir&IRQ_KEYB_MASK) /* may handle it even if actually disabled*/
{
irq_tab[Q40_IRQ_KEYBOARD].count++;
irq_tab[Q40_IRQ_KEYBOARD].handler(Q40_IRQ_KEYBOARD,irq_tab[Q40_IRQ_KEYBOARD].dev_id,fp);
}
}
int q40_get_irq_list (char *buf)
{
int i, len = 0;
for (i = 0; i <= Q40_IRQ_MAX; i++)
{
if (irq_tab[i].count)
len += sprintf (buf+len, "%sIRQ %02d: %8d %s%s\n",
(i<=15) ? "ISA-" : " " ,
i, irq_tab[i].count,
irq_tab[i].devname[0] ? irq_tab[i].devname : "?",
irq_tab[i].handler == q40_defhand ?
" (now unassigned)" : "");
}
return len;
}
static void q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
{
#if 0
printk ("Unknown q40 interrupt 0x%02x\n", irq);
#endif
}
static void sys_default_handler(int lev, void *dev_id, struct pt_regs *regs)
{
#if 0
if (ints_inited)
#endif
printk ("Uninitialised interrupt level %d\n", lev);
#if 0
else
printk ("Interrupt before interrupt initialisation\n");
#endif
}
void (*q40_sys_default_handler[SYS_IRQS]) (int, void *, struct pt_regs *) = {
sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler,
sys_default_handler,sys_default_handler,sys_default_handler,sys_default_handler
};
void q40_enable_irq (unsigned int irq)
{
if ( irq>=5 && irq<=15 )
{
mext_disabled--;
if (mext_disabled>0)
printk("q40_enable_irq : nested disable/enable\n");
if (mext_disabled==0)
master_outb(1,EXT_ENABLE_REG);
}
}
void q40_disable_irq (unsigned int irq)
{
/* disable ISA iqs : only do something if the driver has been
* verified to be Q40 "compatible" - right now IDE, NE2K
* Any driver should not attempt to sleep accross disable_irq !!
*/
if ( irq>=5 && irq<=15 )
{
master_outb(0,EXT_ENABLE_REG);
mext_disabled++;
if (mext_disabled>1) printk("disable_irq nesting count %d\n",mext_disabled);
}
}
unsigned long q40_probe_irq_on (void)
{
printk("irq probing not working - reconfigure the driver to avoid this\n");
return -1;
}
int q40_probe_irq_off (unsigned long irqs)
{
return -1;
}
/*
* Local variables:
* compile-command: "m68k-linux-gcc -D__KERNEL__ -I/home/rz/lx/linux-2.2.6/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -m68040 -c -o q40ints.o q40ints.c"
*/